Blower for sound-producing devices.



G. B. DUSINBERRB.

BLOWER FOR SOUND PRODUGING DEVICES.

APPLIUATION 111.1311 111111.22, 1912.

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BLOWER FOR SOUND PRODUGING DEVICES. APPLICATION FILED MAR.22,1912.

1,120,377'. Patented Dee. 8, 1914.

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GEORGE B. nnsmnnnnn, or CLEVELAND, omo, AssIeNon, Ton. s. rnnlrnniinna CoM- ranr, or CLEVELAND, omo, ,A cornnrnnnsmr, conrosnn or n. s'MUnLLnR AND GEORGE IB. DUSINBERBE.

BLOWER non Vsounn-rnonncind Deviens.

Specication of Letters Patent.

Patented neas, '1914.

Application led March 22, 191.2. Serial No. 685,622.

To all whom it may conce/rn BERRE, a citizen of the `United States, residing at` Cleveland, inthe county of Cuya-` hoga 'and Stateof' 0hio,have invented a certain ynew andY useful Improvement in Blowers for Sound-Producing Devices, of which the following is a full, clear, and ex-I act description, reference being had to the accompanying drawings.I p

The object lof'this invention is to provide an effective ,electrically operated sounding device'adapted to yginie a warning signal.

My sound producing device is especially well adapted for automobile use. It operates'to force successive blasts of air through a suitable horn or' whistle, thereby producing a very effective Warning signal. f

More particularly, the invention 'consists of a cylinder and piston, a solenoid adapted to operate the piston in one direction' and a spring to return it, a horn or whistle operated by the air soy compressed', and an automatically -operated circuit maker and breaker to enablecontinu'ous -operation of the device when' the circuit at the controlling pointI is closed. v

The particular embodiment' of theinven` tion shown in the drawings hereof and hereinafter described is also included Within my invention.

In the-drawings, Figure 1 is a side elevation of niyI sound producing device, an in-- termediate portion of the horn being broken out; Fig'. 2 is an enlarged central longitudinal section through the air compressing de-` vice, showing the plunger in the position of rest; Fig. 3 is a similar-view showing the plunger in' the position it assumes when the solenoid is energized; 1? ig. 4 isa cross section on a reduced scale, as indicated by. the line 4'-4 of Fig. 2;' Fig. 5 is a central" section 'ofa modified form of valve for controlling Ithe admission to the'liorn.

As shown in the* drawings, 10 represents a suitablecylinder of brass or other material, and 11 and 12 caps of suitable material screwing onto the ends thereof. Sultably connected witlithe cap 11 is the whistle or horn 13 adapted to receive air'froinV thecylinder. Within the cylinder is a sliding piston 14 secured upon th'forwardend of the solenoid core 15 of soft iron. This core exnoid and piston is a spring 17 adapted to be compressed by the piston when the core rnoves into the solenoid. When the solenoid 1s energized the core is drawn inwardly and the piston spring assumes the ositionshown 1n Fig. When the solenoid 1s denergized, the spring reacting, forces the piston into substantially the position 'shown in Fig. 2 and thereby compresses the air in front of the piston, which air is forced through an opening in the head into the horn to blow it. The construction of the parts referred to will now be more particularly described.

The solenoid winding '16 is lined by a suitable shell 20 of liber, paper or correspending material and is mounted between the two soft iron disks 21, 22 and Within the soft iron sleeve 23. The disks 21 and 22 are secured to the shell 10 by screws 24, or otherwise, as desired. The soft iron sleeve is shown as seating in annular grooves in the solenoid which is adapted to have a powerful action on the movable iron core 15.

The piston 14 is preferably composed of two disks 30 and 31 secured on the forward end of the core 15, and the leather disk 32 held between them and flanged at its edge against the wall of the cylinder. A pair of nuts 33 screwing onto the end of the core, hold these disks together. The spring 17 referred to is preferably` wound into a conical helix, as shown, and has its largest turn resting against the disk 21 and lying against the cylinder wall. The smallest turn comes close enough to the core 15 so that the spring is not materially displaced in operation.

To control the exit of the air 'compressed in front of the .piston into the horn, I provide a thimble 40 screwed into the cap 11 and-extending into the horn and having a closed outer end and exit openings 41 through its side wall: and slidablc within this thimble is a sleeve 42 which constitutes a valve. yIn the form shown in Figs. 2 and 3 this sleeve is free from the core 15 and is given atendency to move in that direction by a spring 43 compressed between the outer end of the sleeve and the head of the thimble.' In the'position shown in Fig. 2, the' sleeve 42 4closes the ports 41 and prevents the exit of air from the blower into the horn. As the piston is drawn in by the `core, the sleeve 42 Ifollows it under the acand forces the air through the sleeve 42 and,

out through the ports 41 until the engagement of the core with the sleeve 42 moves the latter 'into position to shut o' the ports 41.

In the modification shown in Fig. 5 the valve sleeve 4K7 is secured to the core 15 and the passageway to the ports 41 is throughl openings 48 in the Wall of the sleeve. `With this construction it will be seen that as soon' as the core is' drawn into the solenoid the sleeve 47 beyond the-ports 41, shuts 0H those ports (the check valve 49 then relieving the suction) and when the spring returns the piston, the air is compressed in the end of the cylinder until thepiston almost reaches its extreme position, When the air isv suddenly released into the horn, passing through the openings 51 'into the sleeve and from hence out throughthe ports 48, 41 into the orn.

I desire to call particular attention to the fact that in my device the electro-magnetic force, which returns the piston', increases With the retraction, and that the counteracting force ot the spring also increases with its compression caused by such retraction. The result isi that this increased electro-magnetic energyof the solenoid is stored in potential energy of the spring, so that, on the return of the compressing stroke of the piston, a large force is immediately available for .overcoming the inertia of rest of the piston and accelerating it to quickly bring the air in advance of the piston up to the necessary point of compression to blow the horn. The conico-helical form of the spring should be noted, as by this means l obtain a spring which presents alight resistance at the start and a constantly augmented resistance as it is compressed. rlhus I make the increase vin the counteracting force of the spring more or less nearly the equivalent of the increase in the retracting force of the solenoid with the desired result stated.

lt will be seen from Fig. 2 that, in that embodiment, the port 41 is closed before the piston reaches the extreme forward stroke, and this enables the air in front of the piston to check the movement of the piston, the parts thus constituting an eiiective dash pot incontri to cushion the end of the stroke. @n the backward stroke the air behind the piston passes outwardly throughl the opening 52 in thecylinder. The core fits loosely enough into the shell 2O `so that the air need not retard its inward movement. At the same time, it desired, a certain amount of dash pot action may be obtained on that end of4 the stroke.

To cause-the 'piston to'reciproc'ate continuously Whenever desired, l provide a circuit maker and breaker operated 'by the core' 15,.-'Which ll Will now describe.

Secured Within the casing 10 beyond the disk 22 is an insulating disk 55 which carries =a pair of electric terminals 6:0 and 61.. These terminals may be disconnected from eachother, as shown in Fig. 3, or electrically connected, by a brass or metal ring 63. This ring is mounted on a movable yoke 64 and insulated from it by a sleeve 65. The yoke loosely surrounds a rod -66 which passes loosely throughv the plug 25 but screws into the end of the core 15. @n the rod 66 is a nut 67. When the parts are in their idle position, as shown in Fig. 2, the nut 67 has drawn the yoke toward the left into the opening in ,the insulating disk 55, and this causes the ring 63 to contact" with the terminal springs 60 and 61. The spring 95 61 is one terminal of the outside controlling circuit, the other end of which, after passing through the solenoid, terminates in the spring 60. Accordingly, in the position of. the parts shown in Fig. 2, the circuit is closed through the solenoid and this draws in the core until the end `cnt ,the rod 66 abutting the head of the yoke 64 forces it into the position shown in Fig. 3, which disconnectsthe terminals k60 and 61. This deenergizes the solenoid and the spring forces back the core and the piston -to normal position, and as they come into this osition the nut 67 engaging the yoke draws it to the left and re'stablishes the connection. Accordingly, Whenever the outside ciircuit is closed through the source of current, the core and plunger reciprocate, sending successive blasts of air through the horn.

The electric circuit for operating thedevice is illustrated diagrammatically in Fig. 2. 70 is a suitable push button or switch for closing the circuit, and 71 a battery or other source of power. From the battery the line 72 leads through an insulating sleeve 73, preferably to a binding. post 74 connected with the terminal 61. rllie terminal 6,0 is shown as connected with the binding post 75, from which isconnected one end 76 of the solenoid Winding. rllhe other end 77 ot that Winding is shown as connected With a binding post 7 8, from which a conductor 79 leads outwardly through the insulating sleeve 80 to the Wire 81, returning to the switch 70. ll have shown adjacent points 83 on the two binding posts 75 and 78 to form a protection for the solenoid against discharge, as the same would arc from one point 83 to the other and thus save the solenoid.

My device, it will be seen, is simple in construction and may be very neat in appearance. It is very effective in giving a succession of warning blasts and is operated with the maximum of ease, it being only necessary to close the switch or press a button and the succession of blasts continues as long as the circuit is closed. Practice has demonstrated that such succession of blasts is a much more effective warning than a single blast.

Having thus described my invention, what l claim is:

l. rlihe combination of a cylinder, a solenoid therein, a piston in the cylinder, a movable core for the solenoid connected with the piston, a spring between the piston and solenoid, a thimble having a port, and a slidable sleeve within the thimble adapted to control such port, said sleeve being movable by the core and piston.

2. The-combination of a cylinder, a piston therein, electro-magnetic means for moving the piston in one direction, a spring for moving it in the opposite direction, and a valve in the end wall of the cylinder adapted to be moved by contact with the piston for controlling the passage of air from in front of the piston.

3. The combination, with a cylinder, of a solenoid therein, a movable core for the solenoid, a piston operated by the same and secured to it, a spring surrounding the core between the piston and solenoid and tending to force the piston away from the solenoid, and a sleeve valve in vthe end wall of the cylinder actuated by the movement of `the piston for controlling the exit oi air.

4l. The combination, with a cylinder and piston, of a solenoid, a core for the solenoid adapted to move the piston in one direction, a helical spring acting on the piston presenting a continuously increasing resistance to 4the increasing pull et the solenoid, whereby the spring in reacting exerts its maximum force at the start, and a valve operated by the expanding spring for releasing fluid which the spring has compressed.

5. The combination, with a cylinder, of a solenoid therein, a piston in the cylinder, a movable core for the solenoid connected `with the piston, a conical helical spring interposed between the piston and the solenoid, and a sleeve valve movable in the end wall of the cylinder adapted to be moved. by the piston.

G. The combination, with a cylinder and a piston, of a solenoid for retracting the piston, a spring for moving the piston in the direction to compress air, a sleeve valve in the end 'all of the cylinder-adapted to be normally open during a major portion of the movement of the piston and adapted to L i closed by the movement of the piston near the end of the compression stroke, thereby providing an air cushion to check the movement o'l' the piston.

7. The combination, with a cylinder and piston, of a solenoid for retracting the piston with an increasing force, a conical helical spring for resisting such retraction with an increasing force and reacting on the piston with a diminishing force during the compressing action, and a valve operated by the expanding spring for releasing fluid which the spring has compressed.

S. The combination, with a cylinder and piston, of a valve for controlling discharge .trom the cylinder, a solenoid for retracting the piston, a spring for moving the piston in the direction to compress air, and means for automatically operating the valve to shut oil' the communication from the cylinder near the forward end of the stroke of the piston to provide an air cushion checking the movement of the piston.

ln testimony whereof, l hereunto allix my signature in the presence of two witnesses.

GEORGE B. DUSINBERRE.

`Witnesses Amsnirr ll. Barns, J. B. llULL. 

